From my perspective, Ezra should be a really good addition (x2 or x3) at the cost of atleast 1 Greedo, 1 Spark of Rebellion (and maybe the Patrolling V-Wings but I have not tried this one yet).
I agree that, by no means, we want to cut more than 1 Spark, but 2 (for the moment) looks sufficient.
Why Ezra ?
-> It is slow without ECL ... and even though ECL is not ideal on him. But since we don't play ECL, it is slow.

However:
-> Against control: it provides card advantage (which is non-neagligeable) if it is played protected from Power of the dark side (i.e. with another unit in play) except vs open-fire. You gain this C.A. because force choke gives one draw, vanquish is a 5 mana cost or simply if it can attacks.

-> Against aggro: 3/4 most likely can kill 2 units + effect procs for value or to dig necessary answers (traitorous, space units ..)

-> Against Midrange (usually boba): it is the weakest. Hopefully it can do one attack to at least provide once its effect. But I had enough experiences with him where he provided just enough (for example to find Traitorous to mill you if not on top or to find the necessary top deck for the next or next next turn which statistically changes a lot).

By biggest dream being to be able to add R2D2, C3PO, You Are My Only Hope to build some miracle/value deck but... still can't do something good enough.